US7092662B2 - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
- Publication number
- US7092662B2 US7092662B2 US10/923,833 US92383304A US7092662B2 US 7092662 B2 US7092662 B2 US 7092662B2 US 92383304 A US92383304 A US 92383304A US 7092662 B2 US7092662 B2 US 7092662B2
- Authority
- US
- United States
- Prior art keywords
- toner
- image
- carrier
- image forming
- forming apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
Definitions
- the present invention relates to an image forming apparatus such as an electrophotographic printer and a copier.
- An image forming apparatus such as an electrophotographic printer and a copier forms an image on a recording medium by performing an image forming cycle including a charging process in which a photosensitive drum is imparted with electric charge, an exposing process in which an electrostatic latent image is formed on surface of the photosensitive drum in accordance with image data, a developing process in which the electrostatic latent image is visualized by transferring toner from a developing roller on which a thin toner layer is formed to the electrostatic latent image, a transferring process in which the visualized image (toner image) is transferred to the recording medium such as paper, and a fixation process in which the toner image transferred to the recording medium is fixed by applying heat and pressure to the toner image.
- the amount of toner on the developing roller is environment-dependent, that is, it varies with surrounding temperature and humidity.
- the variation of the amount of toner on the developing roller causes variation of density of the toner image formed on the recording medium.
- the amount of toner on the developing roller of the image forming apparatus when operating under low temperature and low humidity for example under temperature of 10 degrees C. and humidity of 20%, is greater than that when operating under normal temperature and normal temperature. If the amount of toner on the developing roller becomes too great, density non-uniformity or fogging occurs and image quality is degraded.
- the present invention has been made in light of the above-described problem with an object of providing an image forming apparatus which is capable of keeping density level of printed images at the same level under changing environment and avoiding thin spots from occurring in printed images for at least 10,000 continuous image forming cycles.
- an image forming apparatus including:
- a charging device for charging a surface of the image carrier
- an exposing device for exposing the surface of the image carrier charged by the charging device to an exposure light in order to form an electrostatic latent image on the surface of the image carrier
- a developing device for developing the electrostatic latent image by causing toner adhere to the electrostatic latent image
- thermometer for measuring surrounding temperature
- the developing device including a toner carrier for carrying toner to be supplied to the image carrier, a toner supplying device for supplying toner to the toner carrier, and a toner regulating member for shaping toner on the toner carrier supplied from the toner supplying device into a thin toner layer;
- the toner carrier, the toner supplying device and the toner regulating member are applied with voltages VD, VS, and VB respectively, the voltages VD, VS, and VB being determined depending on surrounding temperature measured by the thermometer and satisfying relationship of
- an image forming apparatus including:
- a charging device for charging a surface of the image carrier
- an exposing device for exposing the surface of the image carrier charged by the charging device to an exposure light in order to form an electrostatic latent image on the surface of the image carrier
- a developing device for developing the electrostatic latent image by causing toner adhere to the electrostatic latent image
- the developing device including a toner carrier for carrying toner to be supplied to the image carrier, a toner supplying device for supplying toner to the toner carrier, and a toner regulating member for shaping toner on the toner carrier supplied from the toner supplying device into a thin toner layer;
- the toner carrier, the toner supplying device and the toner regulating member are applied with voltages VD, VS, and VB respectively, the voltages VD, VS, and VB being determined depending on surrounding humidity measured by the hygrometer and satisfying relationship of
- FIG. 1 shows a schematic structure of an image forming apparatus according to a first embodiment of the present invention
- FIG. 2 is a block diagram of a control system of the image forming apparatus according to the first embodiment
- FIG. 3 shows a table which is used for determining environment-compensation values from measured surrounding temperature and humidity in the image forming apparatus according to the first embodiment
- FIG. 4 shows a table which is used for determining the values of voltages applied to specific parts of the image forming apparatus according to the first embodiment on the basis of the environment-compensation values;
- FIG. 5 shows a table which is used for modifying the values of the voltages determined by referring to the table shown in FIG. 4 on the basis of a count value indicating the cumulative number of the image forming cycles executed in the image forming apparatus according to the first embodiment
- FIG. 6 is a flowchart explaining the operation of the image forming apparatus according to the first embodiment of the invention.
- FIG. 7 shows tables which provide results of evaluation of quality of printed images in the image forming apparatus according to the first embodiment
- FIG. 8 shows a schematic structure of an image forming apparatus according to a second embodiment of the present invention.
- FIG. 9 is a block diagram of a control system of the image forming apparatus according to the second embodiment.
- FIG. 10 shows a table which is used for determining the values of voltages applied to specific parts of the image forming apparatus according to the second embodiment on the basis of the environment-compensation values
- FIG. 11 shows a table which is used for modifying the values of the voltages determined by referring to the table shown in FIG. 10 on the basis of a count value indicating the cumulative number of the image forming cycles executed in the image forming apparatus according to the second embodiment.
- FIG. 1 shows a schematic structure of an image forming apparatus according to a first embodiment of the present invention.
- 1 denotes a photosensitive drum as an image carrier
- 3 denotes a charging roller for charging the surface of the photosensitive drum 1
- 4 denotes an exposing head including LEDs
- 5 denotes a developing device
- 7 denotes a transferring roller disposed opposite the photosensitive drum 1
- 10 denotes paper as a recording medium.
- the charging roller 3 is disposed alongside the photosensitive drum 1 so as to keep in contact with the surface of the photosensitive drum 1 .
- the charging roller 3 is applied with a voltage produced by a not-illustrated power supply for charging the surface of the photosensitive drum 1 .
- the exposing head 4 exposes the charged surface of the photosensitive drum 1 selectively to the lights emitted from the LEDs on the basis of image data corresponding to an image to be printed.
- the developing device 5 includes a toner reservoir 50 , a developing roller 54 , a toner-supplying roller 53 , and a toner-layer-thickness regulating blade 52 .
- the toner reservoir 50 includes a toner-agitating bar 51 for performing agitation, friction electrification of toner, and transportation of toner.
- the developing roller 54 and the toner-supplying roller 53 are provided with voltages produced by power supplies 63 and 62 respectively.
- the developing roller 54 is disposed alongside the photosensitive drum 1 so as to keep in contact with the surface of the photosensitive drum 1 .
- the toner-supplying roller 53 is disposed along side the developing roller 54 so as to keep in contact with the surface of the developing roller 54 .
- the toner-layer-thickness-regulating blade 52 is disposed alongside the developing roller 54 such that it is pressed against the surface of the developing roller 54 by a constant pressure.
- the paper 10 is transported in the direction shown by an arrow A in FIG. 1 by a not-illustrated transporting means, the photosensitive drum 1 and the transferring roller 7 .
- the transferring roller 7 which is applied with a controlled voltage by a not-illustrated power supply, transfers a toner image formed on the surface of the photosensitive drum 1 to the paper 10 with electrostatic action.
- the toner image on the paper 10 is fixed thereon by a not-illustrated fixing device.
- a cleaning blade 20 is disposed alongside the photosensitive drum 1 such that it is pressed against the surface of the photosensitive drum 1 by a constant pressure. The residual toner not having been transferred to the paper 10 and remaining on the surface of the photosensitive drum 1 is scraped into a toner-collecting device 21 .
- FIG. 2 is a block diagram of a control system of the image forming apparatus according to the first embodiment of the invention.
- 101 denotes a main control section.
- This main control section 101 controls other sections in accordance with programs stored in a memory section 107 consisting of semiconductor memories or magnetic disks.
- the memory section 107 also stores temporary data necessary for executing various operations.
- 102 denotes an input-output section for performing data-input operation and data-output operation with an external control apparatus such as a personal computer.
- 103 denotes an operation panel allowing a user to make the setting of the image forming apparatus including the number of copies, selection of media types, etc.
- 104 denotes a motor control section for controlling a motor 105 driving the developing device 5 , the photosensitive drum 1 , the transferring roller 7 , etc.
- 106 denotes a thermohygrometer for measuring surrounding temperature and relative humidity.
- 109 denotes an exposing-head control section which controls light-exposing operation of the exposing head 4 on the basis of data received through the data input-output section 102 .
- 110 denotes a developing-voltage control section which controls the power supply 63 such that the voltage VD produced by the power supply 63 and applied to the developing roller 54 is set to a value determined in accordance with instruction received from the main control section 101 .
- 111 denotes a toner-supplying-voltage control section for controlling the power supply 62 such that the voltage VS produced by the power supply 62 and applied to the toner-supplying roller 53 is set to a value determined in accordance with instruction received from the main control section 101 .
- 112 denotes a toner-layer-thickness-regulating-voltage control section which controls the power supply 61 such that the voltage VB produced by the power supply 61 and applied to the toner-layer-thickness-regulating blade 52 is set to a value determined in accordance with instruction received from the main control section 101 .
- 108 denotes a charging-voltage control section which controls a power supply 114 such that the voltage produced by the power supply 114 and applied to the charging roller 3 is set to a value determined in accordance with instruction received from the main control section 101 .
- 113 denotes a transferring-voltage control section which controls the power supply 115 such that the voltage produced by the power supply 115 and applied to the transferring roller 7 is set to a value determined in accordance with instruction received from the main control section 101 .
- the charging roller 3 charges the surface of the photosensitive drum 1 to about ⁇ 700V. As the charged photosensitive drum 1 rotates, the surface thereof is selectively exposed to the exposure lights emitted by the LEDs of the exposing head 4 . Exposed areas in the surface of the photosensitive drum 1 reduce to nearly 0V. As a result, an electrostatic latent image is formed on the surface of the photosensitive drum 1 . When the photosensitive drum 1 further rotates and the electrostatic latent image reaches the position at which it faces the developing roller 54 , the toner negatively charged and shaped into a thin layer on the developing roller 54 moves to a portion of the surface of the photosensitive drum 1 in which the electrostatic latent image is formed so that the electrostatic latent image is visualized. Thus, a visible toner image is formed on the photosensitive drum 1 .
- the toner image formed on the surface of the photosensitive drum 1 reaches a position at which it faces the paper 10 being transported by a not illustrated transporting mechanism
- the toner image is transferred to the paper 10 by the transferring roller 7 .
- the toner image on the paper 10 is fixed by a not-illustrated fixing device.
- the paper 10 bearing the toner image is transported by a not-illustrated paper transporting mechanism and ejected from the image forming apparatus.
- the residual toner not having been transferred to the paper 10 and remaining on the surface of the photosensitive drum 1 is scraped by the cleaning blade 20 as the photosensitive drum 1 rotates.
- the residual toner scraped off the photosensitive drum 1 is collected by the toner-collecting device 21 and conveyed to a not-illustrated waste tank.
- the main control section 101 has a counter (not shown) for counting the cumulative number of image forming cycles or printing cycles executed. This cumulative number (referred to as “count value C” hereinafter) stored in the memory section 107 is incremented each time the image forming cycle is completed.
- the toner-supplying roller 53 and the developing roller 54 are applied with the voltages VS and VD respectively.
- the toner-layer-thickness-regulating blade 52 is applied with the voltage VB.
- the toner in the toner reservoir 50 is agitated by the toner-agitating bar 51 , and supplied to the developing roller 54 by the action of the toner-supplying roller 53 .
- the toner is imparted with negative charge through friction with the toner-agitating bar 51 , toner-supplying roller 53 , developing roller 54 , and the toner-layer-thickness-regulating blade 52 .
- the toner is imparted with negative charge also by the voltage VB applied to the toner-layer-thickness-regulating blade 52 .
- the amount of the toner supplied to the developing roller 54 is controlled by the voltage VS applied to the toner-supplying roller 53 .
- the toner supplied to the developing roller 54 is shaped into a thin layer by the toner-layer-thickness-regulating blade 52 .
- the amount of the toner formed in the shape of a thin layer on the developing roller 54 is controlled by the voltage VB applied to the toner-layer-thickness-regulating blade 52 .
- the amount of the toner moved from the developing roller 54 to the photosensitive drum 1 to visualize the electrostatic latent image is controlled by the voltage VD applied to the developing roller 54 .
- the voltages VD, VS, and VB applied to the developing roller 54 , toner-supplying roller 53 , and toner-layer-thickness-regulating blade 52 respectively are determined on the basis of surrounding temperature and humidity measured by the thermohygrometer 106 and the count value C stored in the memory section 107 .
- the image forming apparatus is provided with TABLE 1 shown in FIG.
- thermohygrometer 106 which is used for determining an environment-compensation value from temperature and humidity measured by the thermohygrometer 106
- TABLE 2 shown in FIG. 4 which is used for determining the values of the voltages VD, VB, and VS in accordance with the environment-compensation value.
- the image forming apparatus is further provided with TABLE 3 shown in FIG. 5 for modifying the values of the voltages VD, VB, and VS in accordance with the count value C.
- step S 1 the main control section 101 reads surrounding temperature T and relative humidity H measured by the thermohygrometer 106 .
- step S 2 the main control section 101 determines the environment-compensation value on the basis of the surrounding temperature T and relative humidity H with reference to TABLE 1 .
- step S 3 the main control section 101 reads the count value C from the memory section 107 .
- step S 4 the main control section 101 determines correction voltages CD, CS, and CB in accordance with the count value C with reference to TABLE 3 .
- step S 5 the motor control section 104 causes the motor 105 to start so that the developing device 5 , photosensitive drum 1 , transferring roller 7 , paper transporting mechanism and fixing device start to operate.
- step S 6 the main control section 101 causes the power supplies 63 , 62 , 61 to apply the voltages VD, VS, VB which have been added with the compensation voltages CD, CS, and CB respectively to the developing roller 54 , toner-supplying roller 53 , and toner-layer-thickness-regulating blade 52 respectively.
- step S 7 the charging process, exposing process, developing process, and transferring process are executed.
- step S 8 the count value C is incremented by 1.
- step S 9 the main control section 101 checks whether or not the image data received includes an end-of-print signal. If it includes the end-of-print signal, the process goes to step S 10 . If not, the process returns to step S 7 .
- step S 10 the main control section 101 writes the updated count value C in the memory section 107 .
- TABLE 4 shown in FIG. 7 provides results of image-quality evaluation when an image having an area equal to 1% of a printable area of a sheet of recording paper has been printed on about 10,000 sheets of the recording paper for each of several combinations of
- represents an absolute value of difference between the values of the voltages VB and VD
- represents an absolute value of difference between the values of the voltages VS and VD.
- the mark “X” means that thin spots have occurred in edges of a printed image when a full-page size black image is printed, that is, when the whole printable area of the paper is printed in black (100% density) just after the image having an area equal to 1% of a printable area of a sheet of the recording paper has been printed on about 10,000 sheets of the recording paper.
- the mark “O” means that such shin spots have not occurred and any image quality degradation has not been perceived.
- TABLE 4 to TABLE 6 show that there is a range defined by
- the image forming apparatus is provided with TABLES 4 , 5 and 6 to determine the voltages VD, VB, VS with which densities of printed images can be kept at the same level under changing environment and the above-described thin spots can be avoided from occurring in the printed images.
- the image forming apparatus according to the first embodiment is provided with a thermohygrometer for measuring both of the surrounding temperature and the surrounding humidity according to which the environment-compensation value is determined, it is possible to provide the image forming apparatus with one of a thermometer and a hygrometer for measuring the surrounding temperature or the surrounding humidity and to determine the environment-compensation value according to the surrounding temperature or the surrounding humidity.
- FIG. 8 shows a schematic structure of an image forming apparatus according to the second embodiment.
- the second embodiment differs from the fist embodiment in that the power supply 62 for applying the voltage to the toner-supplying roller 53 also serves as a power supply for applying a different voltage to the developing roller 54 .
- the voltage produced by the power supply 62 is applied to the developing roller 54 through a resistor 64 so that voltage difference of 230 V exists between the toner-supplying roller 53 and the developing roller 54 .
- FIG. 9 is a block diagram of a control system of the image forming apparatus according to the second embodiment. As shown in FIG.
- a developing-voltage/toner-supplying-voltage control section 116 is used instead of the developing-voltage control section 110 and the toner-supplying-voltage control section 111 .
- the voltages VD, VB, and VS are determined by using TABLE 7 and TABLE 8 shown in FIG. 10 and FIG. 11 instead of TABLE 2 and TABLE 3 shown in FIG. 4 and FIG. 5 .
- the second embodiment has the advantage of being simpler in structure than the first embodiment.
- is set to 230V, it can be increased up to 260V without loosing the above-described advantageous effects.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
Abstract
Description
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003209076A JP2005070135A (en) | 2003-08-27 | 2003-08-27 | Image forming apparatus |
JP2003-209076 | 2003-08-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050047808A1 US20050047808A1 (en) | 2005-03-03 |
US7092662B2 true US7092662B2 (en) | 2006-08-15 |
Family
ID=34209015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/923,833 Active 2024-12-02 US7092662B2 (en) | 2003-08-27 | 2004-08-24 | Image forming apparatus |
Country Status (2)
Country | Link |
---|---|
US (1) | US7092662B2 (en) |
JP (1) | JP2005070135A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060239702A1 (en) * | 2005-04-22 | 2006-10-26 | Konica Minolta Business Technologies, Inc. | Image Forming Apparatus And Developing Method |
US20100303486A1 (en) * | 2009-06-01 | 2010-12-02 | Canon Kabushiki Kaisha | Image forming apparatus |
US20120237229A1 (en) * | 2011-03-17 | 2012-09-20 | Ricoh Company, Ltd. | Fixing device, fixing device control method, and image forming apparatus |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7844203B2 (en) * | 2006-01-12 | 2010-11-30 | Seiko Epson Corporation | Development apparatus and image forming apparatus using the same |
JP4560096B2 (en) * | 2008-02-25 | 2010-10-13 | 株式会社沖データ | Image forming apparatus |
JP4669557B2 (en) * | 2008-08-29 | 2011-04-13 | 株式会社沖データ | Image forming apparatus |
JP6646543B2 (en) * | 2016-07-28 | 2020-02-14 | 株式会社沖データ | Image forming device |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5183964A (en) * | 1992-01-03 | 1993-02-02 | Eastman Kodak Company | Toner charge control |
US5594198A (en) * | 1994-05-18 | 1997-01-14 | Fujitsu Limited | Developing device using one-component type developer |
US5689782A (en) * | 1994-06-08 | 1997-11-18 | Ricoh Company, Ltd. | Developing apparatus for electronic photographic recording equipment, having two developer transfer rollers |
US5708942A (en) * | 1994-05-12 | 1998-01-13 | Ricoh Company, Ltd. | Developing device for an image forming apparatus |
JPH117198A (en) | 1997-06-17 | 1999-01-12 | Murata Mach Ltd | Image forming device |
US5978635A (en) * | 1998-02-03 | 1999-11-02 | Sharp Kabushiki Kaisha | Image developing device using a one-component toner |
US6064847A (en) * | 1999-06-21 | 2000-05-16 | Sharp Kabushiki Kaisha | Developing device |
US20010026715A1 (en) * | 2000-03-30 | 2001-10-04 | Hiroshi Tatsumi | Developing apparatus |
US20010055502A1 (en) * | 2000-05-26 | 2001-12-27 | Fujitsu Limited | Development device and development method, and image-forming device |
US6711372B1 (en) * | 1999-08-19 | 2004-03-23 | Katsuragawa Denki Kabushiki Kaisha | Developing apparatus |
-
2003
- 2003-08-27 JP JP2003209076A patent/JP2005070135A/en active Pending
-
2004
- 2004-08-24 US US10/923,833 patent/US7092662B2/en active Active
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5183964A (en) * | 1992-01-03 | 1993-02-02 | Eastman Kodak Company | Toner charge control |
US5708942A (en) * | 1994-05-12 | 1998-01-13 | Ricoh Company, Ltd. | Developing device for an image forming apparatus |
US5594198A (en) * | 1994-05-18 | 1997-01-14 | Fujitsu Limited | Developing device using one-component type developer |
US5689782A (en) * | 1994-06-08 | 1997-11-18 | Ricoh Company, Ltd. | Developing apparatus for electronic photographic recording equipment, having two developer transfer rollers |
JPH117198A (en) | 1997-06-17 | 1999-01-12 | Murata Mach Ltd | Image forming device |
US5978635A (en) * | 1998-02-03 | 1999-11-02 | Sharp Kabushiki Kaisha | Image developing device using a one-component toner |
US6064847A (en) * | 1999-06-21 | 2000-05-16 | Sharp Kabushiki Kaisha | Developing device |
US6711372B1 (en) * | 1999-08-19 | 2004-03-23 | Katsuragawa Denki Kabushiki Kaisha | Developing apparatus |
US20010026715A1 (en) * | 2000-03-30 | 2001-10-04 | Hiroshi Tatsumi | Developing apparatus |
US20010055502A1 (en) * | 2000-05-26 | 2001-12-27 | Fujitsu Limited | Development device and development method, and image-forming device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060239702A1 (en) * | 2005-04-22 | 2006-10-26 | Konica Minolta Business Technologies, Inc. | Image Forming Apparatus And Developing Method |
US7555232B2 (en) * | 2005-04-22 | 2009-06-30 | Konica Minolta Business Technologies, Inc. | Image forming apparatus and developing method |
US20100303486A1 (en) * | 2009-06-01 | 2010-12-02 | Canon Kabushiki Kaisha | Image forming apparatus |
US8428477B2 (en) * | 2009-06-01 | 2013-04-23 | Canon Kabushiki Kaisha | Image forming apparatus |
US20120237229A1 (en) * | 2011-03-17 | 2012-09-20 | Ricoh Company, Ltd. | Fixing device, fixing device control method, and image forming apparatus |
US8712264B2 (en) * | 2011-03-17 | 2014-04-29 | Ricoh Company, Ltd. | Fixing device, fixing device control method, and image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2005070135A (en) | 2005-03-17 |
US20050047808A1 (en) | 2005-03-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7254350B2 (en) | Image forming apparatus featuring a variable oscillating electric field formed between a developer carrying member and an image bearing member during a developer operation in accordance with a peripheral speed of the image bearing member | |
US6845222B2 (en) | Image forming method and image forming apparatus for suppressing movement of developer onto the electrostatic latent image carrier when the voltages applied to the charging and developing devices are raised or lowered | |
US5761589A (en) | Detachable developing device for providing first and second voltages for an image forming apparatus | |
US8428477B2 (en) | Image forming apparatus | |
US5749022A (en) | Charging apparatus and method for use in image forming device | |
CN105531631B (en) | Image forming apparatus | |
US7319829B2 (en) | Transfer bias adjustment based on component life | |
US6125245A (en) | Image forming apparatus | |
JP4401835B2 (en) | Image forming apparatus | |
US6785482B2 (en) | Image forming apparatus having a transfer current detection device and control for developing bias in non-image area | |
JP2007086660A (en) | Image forming apparatus | |
JP4724464B2 (en) | Image forming apparatus | |
US7092662B2 (en) | Image forming apparatus | |
US7062184B2 (en) | Image formation device and sheet material selection device | |
JPH05134545A (en) | Method for controlling replenishment of toner | |
JP2010107727A (en) | Image forming apparatus | |
JP4193853B2 (en) | Developing device and image forming apparatus using the same | |
JP3817930B2 (en) | Developing device and image forming apparatus using the same | |
US20050141000A1 (en) | Image-forming device | |
JP2002082578A (en) | Image forming method and image forming device | |
JP2006221102A (en) | Developing apparatus and developing method | |
JP2013148808A (en) | Developing device, and image forming apparatus using the same | |
JP4776979B2 (en) | Image forming apparatus | |
JP2004101810A (en) | Development device, process cartridge, image forming apparatus and storage medium | |
JP3734934B2 (en) | Image forming apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: OKI DATA CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YAMAMURA, AKIHIRO;REEL/FRAME:015734/0088 Effective date: 20040809 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553) Year of fee payment: 12 |
|
AS | Assignment |
Owner name: OKI ELECTRIC INDUSTRY CO., LTD., JAPAN Free format text: MERGER;ASSIGNOR:OKI DATA CORPORATION;REEL/FRAME:059365/0145 Effective date: 20210401 |